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Full text of "The manufacture and properties of iron and steel"

INFLUENCE OP CERTAIN ELEMENTS ON STEEL.
353
bar in the grips and make a sudden jar upon the piece. This action, coupled with the stress upon the outside fibers and the direct vibr&-tion, makes the test quite exhaustive, although from the difficulty
TABLE XVII-F.
Resistance to Shock of Steel Containing about 1 Per Cent, of
Manganese.
All tests Ji-inch rolled rounds, made toy The 'Pennsylvania Steel Company.
Heat number.	Manganese; per cent.	Conditions under which test "was made.	Ultimate strength; pounds per square inch.	Elastic limit; pounds per square inch.	Elongation in 8 inches ; per cent.	Reduction of area ; per cent. j
COCO	1.00	Average of two tests, pulled quietly . .  . .	71040 70770	47055 46380	25.87 26.12	55.05 61.40
		Average of two, hammered from start to finish  ..................				
						
0901	1.03	Average of two tests, pulled quietly .....	72175 71120	48075 47330	27.00 26.00	54.98 59.20
		Average of two, hammered from start to finish  ...................				
						
6062	0.94	Average of two tests, pulled quietly .....	74020 74490	48165 48840	25.62 28.50	52.60 65.70
		Average of two, hammered from start to finish,  ............				
						
6068	1.18	One bar, pulled quietly ............	81070, 80460 78050 69040	52880 52760 51800 52760	22.50 28.50 19.25 21.00	43.60 48.30 55.80 47.80
		One bar, hammered from elastic limit to fracture ..................				
		One bar, hammered from failure to fracture, One bar. began hammering at 72000 pounds, and moved scale weight back as the barweakened ...............				
						
6981	0.82	One bar, pulled quietly   ..........	67340 65940	46030 44430	28.12 28.00	55.00 57.90
		One bar, hammered from failure to fracture,				
6082	0.91	One bar, pulled quietly ..... ......	66700 67240	46310 46090	26.00 81.25	55.93 55.60
		One bar, hammered from failure to fracture,				
6983	1.03	One bar, pulled quietly ...........	69700 70080	47650 46360	26.00 27.12	51.70 58.70
		One bar, hammered from failure to fracture,				
of measuring the force of impact it can hardly be called practical. Some of the bars were not struck until "failure/' or until the maximum stress had been reached. This was on account of the slipping or jumping above noted which followed the hammering at earlier periods, and it was taken for granted that if a bar would break at all from shock, the fracture would be likely to occur about the time when the piece was under destructive tension. The hammering did not in any case determine the time of breakage, for each piece gave as good an elongation and reduction of area as a